build on Mac Os X 10.5 for 10.4 and later:

export MACOSX_DEPLOYMENT_TARGET=10.4

# CHARM_BUILD_STATIC_QT is necessary to link static plugins
# ../charm-1.2/ is the src directory
cmake -DCMAKE_BUILD_TYPE=release \
        -DCHARM_BUILD_STATIC_QT:BOOL=TRUE \
        -DCMAKE_OSX_SYSROOT:STRING=/Developer/SDKs/MacOSX10.4u.sdk/ \
        ../charm-1.2/
make && make install
